/* * linux/arch/sh/kernel/sys_sh.c * * This file contains various random system calls that * have a non-standard calling sequence on the Linux/SuperH * platform. * * Taken from i386 version. */ #include <linux/errno.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/smp.h> #include <linux/smp_lock.h> #include <linux/sem.h> #include <linux/msg.h> #include <linux/shm.h> #include <linux/stat.h> #include <linux/syscalls.h> #include <linux/mman.h> #include <linux/file.h> #include <linux/utsname.h> #include <linux/module.h> #include <asm/cacheflush.h> #include <asm/uaccess.h> #include <asm/ipc.h> /* * sys_pipe() is the normal C calling standard for creating * a pipe. It's not the way Unix traditionally does this, though. */ asmlinkage int sys_pipe(unsigned long r4, unsigned long r5, unsigned long r6, unsigned long r7, struct pt_regs regs) { int fd[2]; int error; error = do_pipe(fd); if (!error) { regs.regs[1] = fd[1]; return fd[0]; } return error; } unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */ EXPORT_SYMBOL(shm_align_mask); /* * To avoid cache aliases, we map the shared page with same color. */ #define COLOUR_ALIGN(addr, pgoff) \ ((((addr) + shm_align_mask) & ~shm_align_mask) + \ (((pgoff) << PAGE_SHIFT) & shm_align_mask)) unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma; unsigned long start_addr; int do_colour_align; if (flags & MAP_FIXED) { /* We do not accept a shared mapping if it would violate * cache aliasing constraints. */ if ((flags & MAP_SHARED) && (addr & shm_align_mask)) return -EINVAL; return addr; } if (unlikely(len > TASK_SIZE)) return -ENOMEM; do_colour_align = 0; if (filp || (flags & MAP_SHARED)) do_colour_align = 1; if (addr) { if (do_colour_align) addr = COLOUR_ALIGN(addr, pgoff); else addr = PAGE_ALIGN(addr); vma = find_vma(mm, addr); if (TASK_SIZE - len >= addr && (!vma || addr + len <= vma->vm_start)) return addr; } if (len > mm->cached_hole_size) { start_addr = addr = mm->free_area_cache; } else { mm->cached_hole_size = 0; start_addr = addr = TASK_UNMAPPED_BASE; } full_search: if (do_colour_align) addr = COLOUR_ALIGN(addr, pgoff); else addr = PAGE_ALIGN(mm->free_area_cache); for (vma = find_vma(mm, addr); ; vma = vma->vm_next) { /* At this point: (!vma || addr < vma->vm_end). */ if (unlikely(TASK_SIZE - len < addr)) { /* * Start a new search - just in case we missed * some holes. */ if (start_addr != TASK_UNMAPPED_BASE) { start_addr = addr = TASK_UNMAPPED_BASE; mm->cached_hole_size = 0; goto full_search; } return -ENOMEM; } if (likely(!vma || addr + len <= vma->vm_start)) { /* * Remember the place where we stopped the search: */ mm->free_area_cache = addr + len; return addr; } if (addr + mm->cached_hole_size < vma->vm_start) mm->cached_hole_size = vma->vm_start - addr; addr = vma->vm_end; if (do_colour_align) addr = COLOUR_ALIGN(addr, pgoff); } } static inline long do_mmap2(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, int fd, unsigned long pgoff) { int error = -EBADF; struct file *file = NULL; flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); if (!(flags & MAP_ANONYMOUS)) { file = fget(fd); if (!file) goto out; } down_write(¤t->mm->mmap_sem); error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); up_write(¤t->mm->mmap_sem); if (file) fput(file); out: return error; } asmlinkage int old_mmap(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, int fd, unsigned long off) { if (off & ~PAGE_MASK) return -EINVAL; return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT); } asmlinkage long sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long fd, unsigned long pgoff) { return do_mmap2(addr, len, prot, flags, fd, pgoff); } /* * sys_ipc() is the de-multiplexer for the SysV IPC calls.. * * This is really horribly ugly. */ asmlinkage int sys_ipc(uint call, int first, int second, int third, void __user *ptr, long fifth) { int version, ret; version = call >> 16; /* hack for backward compatibility */ call &= 0xffff; if (call <= SEMCTL) switch (call) { case SEMOP: return sys_semtimedop(first, (struct sembuf __user *)ptr, second, NULL); case SEMTIMEDOP: return sys_semtimedop(first, (struct sembuf __user *)ptr, second, (const struct timespec __user *)fifth); case SEMGET: return sys_semget (first, second, third); case SEMCTL: { union semun fourth; if (!ptr) return -EINVAL; if (get_user(fourth.__pad, (void * __user *) ptr)) return -EFAULT; return sys_semctl (first, second, third, fourth); } default: return -EINVAL; } if (call <= MSGCTL) switch (call) { case MSGSND: return sys_msgsnd (first, (struct msgbuf __user *) ptr, second, third); case MSGRCV: switch (version) { case 0: { struct ipc_kludge tmp; if (!ptr) return -EINVAL; if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof (tmp))) return -EFAULT; return sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third); } default: return sys_msgrcv (first, (struct msgbuf __user *) ptr, second, fifth, third); } case MSGGET: return sys_msgget ((key_t) first, second); case MSGCTL: return sys_msgctl (first, second, (struct msqid_ds __user *) ptr); default: return -EINVAL; } if (call <= SHMCTL) switch (call) { case SHMAT: switch (version) { default: { ulong raddr; ret = do_shmat (first, (char __user *) ptr, second, &raddr); if (ret) return ret; return put_user (raddr, (ulong __user *) third); } case 1: /* iBCS2 emulator entry point */ if (!segment_eq(get_fs(), get_ds())) return -EINVAL; return do_shmat (first, (char __user *) ptr, second, (ulong *) third); } case SHMDT: return sys_shmdt ((char __user *)ptr); case SHMGET: return sys_shmget (first, second, third); case SHMCTL: return sys_shmctl (first, second, (struct shmid_ds __user *) ptr); default: return -EINVAL; } return -EINVAL; } asmlinkage int sys_uname(struct old_utsname * name) { int err; if (!name) return -EFAULT; down_read(&uts_sem); err=copy_to_user(name, &system_utsname, sizeof (*name)); up_read(&uts_sem); return err?-EFAULT:0; } asmlinkage ssize_t sys_pread_wrapper(unsigned int fd, char * buf, size_t count, long dummy, loff_t pos) { return sys_pread64(fd, buf, count, pos); } asmlinkage ssize_t sys_pwrite_wrapper(unsigned int fd, const char * buf, size_t count, long dummy, loff_t pos) { return sys_pwrite64(fd, buf, count, pos); } asmlinkage int sys_fadvise64_64_wrapper(int fd, u32 offset0, u32 offset1, u32 len0, u32 len1, int advice) { #ifdef __LITTLE_ENDIAN__ return sys_fadvise64_64(fd, (u64)offset1 << 32 | offset0, (u64)len1 << 32 | len0, advice); #else return sys_fadvise64_64(fd, (u64)offset0 << 32 | offset1, (u64)len0 << 32 | len1, advice); #endif }